#ifndef _POSITION_H_
#define _POSITION_H_
typedef struct {
	int a;
	int b;
	int (*add_pfn)(int, int);
	int (*sub_pfn)(int, int);
} CALC_EXT;

int add(int a, int b);
int sub(int a, int b);
int calc(int a, int b, int (*pfn)(int, int));
int run(CALC_EXT* calc_ext);
#endif
